Armature for electric machines.



W. J. BAUROTH.

ARMATU'BE FOR ELECTRIC MACHINES.

APPLICATION FILED AUG. 23. 1906.

927,209, Patented July 6, 1909.

Fig. 1.

||||IIHIIIIIIIlllllllllllllllllllll mmm!! lllllllll HQIIIIIIII IIIIIIIIIIIIIIIIIHII UNITED STATES PATENT OFFICE.

WALTER I. BAUROTH, OF COLUMBUS, OIAIIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE JEFFREY MANUFACTURING COMPANY, A CORPORATION OF OHIO.

ARNIAIURE FOR ELECTRIC MACHINES.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed August 23, 1906. Serial No. 331,778.

To all whom it Imay concern:

Be it known that I, IVALTER J. BAUROTH, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Armatures for Electric Machines, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in the construction of armatures for electric machines (dynamos or motors) it relating more particularly to improvements in armatures whose cores comprise a number of sheet metal laminze placed face to face and extending in a series parallel to the axis from end to end of the armature.

Figure 1 is a longitudinal section of an armature constructed in such way as to embody my improvement. Fig. 2 is a cross section on the line 2-2, Fig. l. Fig. 3 is a face view of one of the clamping plates or rings detached, and showing it also in vertical section. Fig. 4 is a side view of the sleeve which is fitted to the shaft and to which are attached the parts of the armature proper and the commutator. Fig. 5 shows detached, one of the keys.

Inasmuch as the present invention in no way relates to the details of construction of the field part of the machine, it is not necessary that it should be described or illustrated.

In the drawings I have shown the shaft of the armature at A. Upon this is secured the sleeve B which is preferably of cast metal cylindrical in form. At one end there is a flange C'and in transverse lines near the other end there is a shoulder at D the surface E between the flange and the shoulder being preferably cylindrical in form. The flange O extends but a relatively short distance outward from the circle of the surface E, and at F there is a shoulder for a purpose to be described. From the shoulder at D the surface M extends uniformly to the end of the sleeve casting B except that at suitable places there are formed recesses Il.

I indicates a plate or relatively wide an nulus having an aperture I ada ted to fit upon the periphery of the flange L and having a shoulder or lla-nge at K adapted to lit the shoulder at F on the sleeve casting. At the other end of the armature there is a plate L with an aperture at the center adapted to fit snugly the cylindrical part M of the sleeve B and to abut against the shoulder at D. This plate or annulus L has ribs or projections Z upon its inner face which extend somewhat beyond the vertical f lilies of the shoulder D so that they are adapted to bear positively against and impart pressure to the laminae of the core before the ring or plate L itself comes to positive abutment against the shoulder D.

The laminas of the core are indicated by N. They may be of any well known or desired shape, I preferring that shown that is to say, each is cut as an annulus and has an inner perforate part n, an intermediate imperforate part nl, a series of perforations n2 and a series of peripheral recesses or ribs n3, the latter intended to receive the coil.

O indicates a key having a shank part o and a head o1. The shank is adapted to lit the recess or socket II in the surface of the end part of the casting B. Of these keys as many as desired may be used, but I have found two to be sufficient. The head part of each lies so as to be against the outer surface of the plate or ring L.

P indicates the commutator for the armature. Its base part is shown at Q which is so shaped as to extend toward the axis and turns toward the armature proper, as shown at It. The central aperture in this commutator base Q. is of such diameter in relation to the external diameter of the sleeve casting B that the commutator can be fastened to the casting with an excessive grip which prevents it from longitudinal movement or escape endwise from the sleeve, this method of fastoning the commutator obviating the neces-- sity of any positive stop and the need of a shoulder or the like.

The manner of assembling the parts of an armature when they are constructed in the way described will be readily understood. The plate or ring I at one end is first put in position with the shoulders at F and K fitted together. Then the lamin N are placed in series in position on the part E of the sleeve until the required number are present. Then the opposite ringl or plate L is slipped into place and pressed tightly against the series of laniinec. Then the keys O are inserted and finally the commutator is pushed to place along the end of the sleeve casting this being done with a force, by hydraulic pressure or otherwise, so great that it is impossible for the commutator to slip out again under ordinary circumstances.

By making the plate or ring I separate from the flange C I provide for "machining these parts much more advantageously than when the :flange and the plate are formed integral, as has formerly been done.

Heretofore the practice has been to fasten the end plate or ring corresponding to that at L either by means of a nut which engages with a thread on the casting or on the shaft, or by means of a ring of easily fusible metal, as Babbitt metal, or by means of a split elastic ring fitted into a groove in the sleeve casting, such as at B. Serious difficulties have been found incident to constructions made in accordance with any of these plans. W hen the nut is used it has been found difficult to lock it at the point where it is desired to have it locked, and if not locked, the vibrations of the parts create a tendency for it to be loosened whereupon it loosens its hold. With those constructions in which the end flange corresponding` to that at L has been fastened by means of rings formed of easily fusible metal, the difficulty has been that in order to disassemble or separate the parts of the armature it has been necessary to heat the metal adjacent to the fusible ring sufliciently to cause the ring to become fluid and run out as liquid and such high heat has frequently been found disastrous to the electric parts and their insulation. And the split elastic rings are troublesome because of the fact that a still further, or supplemental lock, is required to prevent the ends of the ring from flying out from the groove that holds the ring, or otherwise accident may result. All of these troubles are overcome by the construction shown. The keys positively lock the flange or ring L against displacement and the commutator when forced upon the sleeve in the ordinary way holds the keys in place.

I/Vhat I claim is:

l. An armature for an electrical machine having a central tube or sleeve for fitting to a shaft formed with a cylindrical surface, a series of laminae fitted to the said surface and a flange or plate at one end of the said sleeve for holding the laminas against longitudinal displacement, a detachable flange or plate at the other end of the series of laminze, one or more keys seated in sockets in the central sleeve and abutting against the detachable flange or plate, and a commutator having a base tube adapted to slip over the central sleeve and to hold the said keys in position, substantially as set forth.

2. In an armature for an electrical machine, a central sleeve adapted to be fitted to a shaft, a series of laminas mounted upon the said sleeve, a relatively narrow flange on the sleeve at one end of the series of laminas, a supplemental separately formed flange cngaging with the narrow flange at the said end of the series of laminas, a detachable flange or plate at the other end of the series of lamina), means on the sleeve for positively stopping the said flange or plate from movement in the direction of the laminze, a detachable key positioned lengthwise of the sleeve and abute ting against the last said. flange or plate, and a commutator arranged to hold the said key from lateral displacement, substantially as set forth.

S. In an armature for an electrical machine, the combination of the central hub member, the series of laminas on said hub member, the outwardly extending flange rigid with the hub member at one end of the series of laminas, the separable flange or plate on the hub member at the other end of the serios of laminas, the key seated in a socket in the hub member and abutting at one end an end wall of said socket and at its other end the separable flange or plate, and the sleeve constructed to slip over the hub member and. hold the key in position, substantially as set forth.

Il. In an armature for an electrical machine, the combination of the central hub member, the series of laminas on said central hub member, the outwardly extending flange rigid with the hub member', the annular plate engaging said flange and abutting one end of the series of laminae, the separable flange or plate on the hub member at the other end of the series of laminae, the key seated in a socket in the hub member and abutting at one end an end wall of said socket and at its other end the separable flange or plate, and the sleeve constructed to slip over the hub member and hold the key in position, substantially as set forth.

5. In an armature for an electrical machine, the combination of the central hub member, the series of lamin on said. hub member, the outwardly extending flange rigid with the hub member at one end of the series of lamine, the separable flange or plate on the hub member at the other end of the series of laminare, the shoulder on the hub member for stopping the inward movement of the separable flange or plate, the key seated in a socket in the hub member and abutting the separable flange or plate, and the sleeve constructed to slip over the hub member and hold the key in position, substantially as set forth.

6. In an armature for an electrical machine, the combination of the central hub member, the series of laminaJ on said hub member, the outwardly extending flange rigid with the hub member at one end of the series of laminae, the separable flange or plate on the hub member at the other end of the series of laminae, the key seated in the socket in the hub member and abutting at one end an end wall of said socket and at its other end the separable flange or plate, and the commutator fitted over the hub member and holding the key in position, substantially as set forth.

7. In an armature for an electrical ma chine, the combination of the central hub member, the series of laminae on said central hub member, the outwardly extending flange rigid with the hub member, the annular plate engaging said flange and abutting one end of the series of laminae, the separable flange er plate on the hub member at the other end of the series of laminze, the keyv seated in a socket in the hub member and abutting at one end an end wall of said socket and at its other end the separable ilange or plate, and the commutator fitted over the hub member and holding the key in position, substantially as set forth.

S. In an armature for an electrical machine, the combination of the central hub member, the series of laminae on said hub member, the outwardly extending flange rigid with the hub memberl at one end of the series of laminae, the separable flange or plate on the hub member at the other end of the series of laminae, the shoulder on the hub member for stop ing the inward movement of the separable lange or plate, the key seated in a socket in the hub member and abut* ting the separable flange or plate, and the commutator fitted over the hub member and holding the key in position, substantially as set forth.

9. In an armature for an electrical machine, the combination of the central hub member, the series of laminas on said hub member, the outwardly extending flange rigid with the hub member at one end of the series of laminae, the separable flange or plate on the hub member at the other end of the series of laminae, the key seated in a socket in the hub member and abutting at one end an end w all of said socket and at its other end the separable flange or plate, and means engaging the key to hold. it against radial displacement, substantially as set forth.

10. ln an armature for an electrical machine, the combination of the central hub member, the series of laminze on said hub member, the outwardly extending flange rigid with the hub member at one end of the series of laminze, the separable flange or plate on the hub member at the other end of the series of laminze, the shoulder on the hub member for stop ing the inward movement of the separable flhnge or plate, the key seat-- ed in a socket in the hub member and abutting the separable flange or plate, and means engaging the Aiey to hold it against radial displacement, substantially as set forth.

ln testimony whereof I aflix my signature, in presence of two witnesses.

WALTER J. BAUROTl-l.

vWitnesses:

H. S. RANsoM, S. J. WHITE. 

